Corrosion behavior of prestressing steel in a solution of 20% ammonium thiocyanate

Mikiyuki Ichiba, Yuya Niidome, Shunsuke Nakamura, Junïchi Sakai

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    High-strength steels or PC steel products are used for pre-stressed concrete structures. Testing of PC steel products in terms of hydrogen embrittlement is specified in the FIP Report, and the test method adopted in ISO 15630 is well known. This test is called the FIP test, whereby a constant load is applied to PC steel in a 20 , 50 ammonium thiocyanate solution. An investigation was carried out on the corrosion behavior of 1,400 MPa class PC steel products in a FIP testing environment. Under this testing environment, a cathodic reaction associated with oxygen consumption and hydrogen generation was identified from the initial stage of dipping, and corrosive products mainly consisting of ferric sulfide were formed on the surface of a specimen detected in the test pieces. From changes in the amount of gas associated with the reaction, it is understood that, together with this corrosion reaction, there also occurred a reaction involving 1 mol of hydrogen generation or 0.5 mol of oxygen consumption for 1 mol dissolution of iron. It is also assumed that the reaction involving hydrogen generation was a cathodic reaction associated with the decomposition of SCN.

    Original languageEnglish
    Pages (from-to)289-293
    Number of pages5
    JournalZairyo to Kankyo/ Corrosion Engineering
    Volume62
    Issue number8
    Publication statusPublished - 2013

    Fingerprint

    Prestressing
    Steel
    Corrosion
    Hydrogen
    ferrous sulfate
    Testing
    Associated gas
    Oxygen
    Caustics
    Hydrogen embrittlement
    Prestressed concrete
    Sulfides
    High strength steel
    Concrete construction
    Dissolution
    Iron
    Decomposition
    thiocyanic acid

    Keywords

    • Ammonium thiocyanate
    • Corrosion
    • FIP
    • Prestressing steel

    ASJC Scopus subject areas

    • Electrochemistry
    • Materials Chemistry
    • Metals and Alloys
    • Surfaces, Coatings and Films

    Cite this

    Corrosion behavior of prestressing steel in a solution of 20% ammonium thiocyanate. / Ichiba, Mikiyuki; Niidome, Yuya; Nakamura, Shunsuke; Sakai, Junïchi.

    In: Zairyo to Kankyo/ Corrosion Engineering, Vol. 62, No. 8, 2013, p. 289-293.

    Research output: Contribution to journalArticle

    Ichiba, M, Niidome, Y, Nakamura, S & Sakai, J 2013, 'Corrosion behavior of prestressing steel in a solution of 20% ammonium thiocyanate', Zairyo to Kankyo/ Corrosion Engineering, vol. 62, no. 8, pp. 289-293.
    Ichiba, Mikiyuki ; Niidome, Yuya ; Nakamura, Shunsuke ; Sakai, Junïchi. / Corrosion behavior of prestressing steel in a solution of 20% ammonium thiocyanate. In: Zairyo to Kankyo/ Corrosion Engineering. 2013 ; Vol. 62, No. 8. pp. 289-293.
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